Abstract

We have implemented a model of contrast gain control in human vision that incorporates a number of key features, including a contrast sensitivity function, multiple oriented bandpass channels, accelerating nonlinearities, and a divisive inhibitory gain control pool. The parameters of this model have been optimized through a fit to the recent data that describe masking of a Gabor function by cosine and Gabor masks [J. M. Foley, “Human luminance pattern mechanisms: masking experiments require a new model,” J. Opt. Soc. Am. A 11, 1710 (1994)]. The model achieves a good fit to the data. We also demonstrate how the concept of recruitment may accommodate a variant of this model in which excitatory and inhibitory paths have a common accelerating nonlinearity, but which include multiple channels tuned to different levels of contrast [P. C. Teo and D. J. Heeger, “Perceptual image distortion,” in Human Vision, Visual Processing, and Digital Display V, B. E. Rogowitz and J. P. Allebach, eds., Proc. SPIE 2179, 127 (1994)].

© 1997 Optical Society of America

Contrast gain control and fine spatial discriminations

James P. Thomas and Lynn A. Olzak
J. Opt. Soc. Am. A 14(9) 2392-2405 (1997)

Human luminance pattern-vision mechanisms: masking experiments require a new model

John M. Foley
J. Opt. Soc. Am. A 11(6) 1710-1719 (1994)

Visual signal detection in structured backgrounds. II. Effects of contrast gain control, background variations, and white noise

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J. Opt. Soc. Am. A 14(9) 2406-2419 (1997)

Contrast gain control: a bilinear model for chromatic selectivity

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Visual signal detectability with two noise components: anomalous masking effects

Arthur E. Burgess, Xing Li, and Craig K. Abbey
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